Citation: Ertl, A.; Rossman, G. R.; Hughes, J. M.; Prowatke, S.; Ludwig, T. (2005). Mn-bearing "oxy-rossmanite" with tetrahedrally-coordinated Al and B from Austria: Structure, chemistry, and infrared and optical spectroscopic study Sample: REDT1 Reported formula: (Na.46 Ca.01) (Al2.37 Li.33 Mn2+.25 Fe2+.04 Ti4+.01) Al6 (Si5.47 Al.28 B.25) O18 (BO3)3 [(OH)2.85 O.15] [O.86 (OH).10 F.04] Tourmaline. American Mineralogist, 90, pp. 481-487.